Step by step calculation of overload and short circuit currents

Determination of overcurrents and short circuit currents

In a heating system a motor-driven pump with a power of 200 kW, cos φ = 0.88, η = 0.93 is connected through an overhead cable with 1= 45 m (Figure 1).

Let’s see the calculation of the following:

1. Operating current
2. Overload protection
3. Voltage drop
4. Protection by cut-off
5. Short circuit protection
6. Overcurrent relay
7. Direct starting